:root {
  --bg: #0b1120;
  --panel: #0f172a;
  --panel-2: #111d35;
  --border: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --ok: #22c55e;
  --warn: #eab308;
  --err: #ef4444;
  --suggest: #a855f7;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
}

body { display: flex; flex-direction: column; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.brand { display: flex; align-items: baseline; gap: 10px; }
.logo { color: var(--accent); font-size: 22px; line-height: 1; }
.name { font-weight: 600; letter-spacing: 0.3px; }
.tagline { color: var(--muted); font-size: 12px; }

.topbar-actions { display: flex; gap: 8px; }

.btn {
  background: var(--accent);
  color: #001122;
  border: 0;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { background: var(--panel-2); }
.btn.tiny { padding: 3px 8px; font-size: 11px; }

.app {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--panel);
}
.pane + .pane { border-left: 1px solid var(--border); }

.pane-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}
.pane-title { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.8px; }

.status {
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--panel-2);
}
.status.idle { color: var(--muted); }
.status.typing { color: var(--accent); }
.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }
.status.err { color: var(--err); }

.editor { flex: 1 1 auto; min-height: 0; }

.tabs {
  display: flex;
  gap: 2px;
  padding: 0 10px;
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}
.tabs button {
  background: transparent;
  border: 0;
  color: var(--muted);
  padding: 10px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  position: relative;
  top: 1px;
}
.tabs button.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}
.tabs .badge {
  display: inline-block;
  background: var(--err);
  color: white;
  border-radius: 10px;
  padding: 0 6px;
  font-size: 10px;
  font-weight: 700;
  margin-left: 4px;
  vertical-align: middle;
}

.tab-panel {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  padding: 18px;
}

.empty {
  color: var(--muted);
  text-align: center;
  padding: 60px 20px;
}
.empty.clean { color: var(--ok); }

.stats {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
}
.stat {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat .n { font-size: 22px; font-weight: 600; color: var(--text); }
.stat .l { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.8px; }

.section-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin: 0 0 10px 0;
}

.mermaid-wrap {
  background: #0a0f1f;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow: auto;
}
.mermaid-wrap svg { max-width: 100%; height: auto; }

.issues { display: flex; flex-direction: column; gap: 10px; }

.issue {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-radius: 6px;
  padding: 12px 14px;
}
.issue.sev-error   { border-left-color: var(--err); }
.issue.sev-warn    { border-left-color: var(--warn); }
.issue.sev-suggest { border-left-color: var(--suggest); }

.issue-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}
.sev {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--panel);
}
.sev-error   .sev { color: var(--err); }
.sev-warn    .sev { color: var(--warn); }
.sev-suggest .sev { color: var(--suggest); }

.issue-title { font-weight: 500; flex: 1; }
.issue-site { font-size: 11px; color: var(--muted); font-family: ui-monospace, monospace; }

.issue-detail { margin: 4px 0 10px 0; color: var(--muted); font-size: 13px; line-height: 1.5; }

.issue-fix {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
}
.fix-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.fix-head span { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.8px; }
.issue-fix pre {
  margin: 0;
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 12px;
  color: var(--accent);
  white-space: pre-wrap;
  word-break: break-word;
}

.sim-form {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  margin-bottom: 18px;
}
.sim-form select, .sim-form input {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 6px;
  font-family: inherit;
  font-size: 13px;
}
.sim-form input { font-family: ui-monospace, monospace; }

.sim-error {
  color: var(--err);
  padding: 10px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--err);
  border-radius: 6px;
}

.sim-summary {
  padding: 12px 14px;
  border-radius: 6px;
  margin-bottom: 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left-width: 3px;
}
.sim-summary.ok   { border-left-color: var(--ok); }
.sim-summary.nope { border-left-color: var(--err); }
.sim-summary code {
  background: var(--panel);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

.trace {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.trace li {
  padding: 8px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.step-kind {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}
.step-msg { font-size: 13px; }
.step-detail { font-size: 12px; color: var(--muted); font-family: ui-monospace, monospace; }
.trace .step-site-match .step-kind  { color: var(--accent); }
.trace .step-handler    .step-kind  { color: var(--ok); }
.trace .step-no-match   .step-kind  { color: var(--err); }
.trace .step-site-skip  { opacity: 0.6; }

.json-box {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  white-space: pre;
  margin: 0;
  color: var(--text);
  background: #0a0f1f;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: auto;
}

.footer {
  padding: 10px 18px;
  font-size: 11px;
  color: var(--muted);
  background: var(--panel);
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
  align-items: center;
}
.footer .sep { opacity: 0.5; }
.footer code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 11px;
}